I got the same problem with mine.
I got this from a different site.
I have a low idle and a high speed adjustment.
I'm going to try this on my high speed since my low is OK.
The setting should be 1.5 turns out from all the way in snug... as a baseline. You have to fine tune it when its warmed up till it revs up and down with little to no hesitation.
Bill
July 2006